<template>
  <section class="msite">
    <!--首页头部-->
    <HearderTop :title="address.name">
      <router-link class="header_search" slot="left" to="./search">
            <i class="iconfont icon-search"></i>
      </router-link>
      <router-link class="header_login" slot="right" :to= " userInfo._id ? '/userinfo ' : '/login'">
        <span class="header_login_text" v-if="!userInfo._id">登录/注册</span>
        <span class="header_login_text" v-else>
          <i class="iconfont icon-geren5"></i>
        </span>
      </router-link>
    </HearderTop>

    <!--首页导航-->
    <nav class="msite_nav">
      <div class="swiper-container" v-if="categorys.length">
        <div class="swiper-wrapper">
          <div class="swiper-slide" v-for="(categorys,index) in categorysArr" :key="index">
            <a href="javascript:" class="link_to_food" v-for="(category,index) in categorys" :key="index">
              <div class="food_container">
                <img :src="imgBaseUrl+category.image_url">
              </div>
              <span>{{category.title}}</span>
            </a>
          </div>
        </div>
        <!-- Add Pagination -->
        <div class="swiper-pagination"></div>

      </div>
      <img src="./images/msite_back.svg" v-else alt="back"></img>
    </nav>

    <!--首页附近商家-->
    <div class="msite_shop_list">
      <div class="shop_header">
        <i class="iconfont icon-xuanxiang"></i>
        <span class="shop_header_title">附近商家</span>
      </div>
      <ShopList/>
    </div>
  </section>
</template>

<script>
  import Swiper from 'swiper'
  import SwiperSlider from 'vue'
  import 'swiper/swiper-bundle.min.css'
  import 'swiper/swiper-bundle.min'
  import HearderTop from "../../components/HearderTop/HearderTop";
  import ShopList from "../../components/ShopList/ShopList";
  import {mapState} from 'vuex'

    export default {
      data(){
        return{
          imgBaseUrl: 'https://fuss10.elemecdn.com'
        }
      },
      mounted() {
        this.$store.dispatch('getCategorys')
        //this.$store.dispatch('getShops')

      },
      components:{
        HearderTop,
        Swiper,
        SwiperSlider,
        ShopList
      },
      computed:{
        ...mapState(['address','categorys','userInfo']),

        /*
        根据categorys一维数组生成一个二维数组
        小数组的元素个数最多为8
         */
        categorysArr(){
          const {categorys} = this
          //准备空的二维数组
          const arr = []
          //准备一个小数组（最大长度为8）
          let minArr = []
          //遍历categorys
          categorys.forEach(c=>{
            //如果当前数组已经满了，创建一个新的
            if (minArr.length===8){
              minArr = []
            }
            //如果minArr是空的，将小数组保存到大数组中
            if (minArr.length===0){
              arr.push(minArr)
            }
            //将当前分类保存到小数组中
            minArr.push(c)
          })
          return arr
        }
      },

      watch:{
        categorys (value){
          //界面更新就创建swiper对象
          this.$nextTick(()=>{
            new Swiper('.swiper-container',{
              loop:true,
              pagination: {
                el: '.swiper-pagination',
              },
            })
          })
        }
      }

    }
</script>

<style lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixins.styl"
  .msite  //首页
    width 100%

    .msite_nav
      bottom-border-1px(#e4e4e4)
      margin-top 45px
      height 200px
      background #fff
      .swiper-container
        width 100%
        height 100%
        .swiper-wrapper
          width 100%
          height 100%
          .swiper-slide
            display flex
            justify-content center
            align-items flex-start
            flex-wrap wrap
            .link_to_food
              width 25%
              .food_container
                display block
                width 100%
                text-align center
                padding-bottom 10px
                font-size 0
                img
                  display inline-block
                  width 50px
                  height 50px
              span
                display block
                width 100%
                text-align center
                font-size 13px
                color #666
        .swiper-pagination
          >span.swiper-pagination-bullet-active
            background #02a774
    .msite_shop_list
      top-border-1px(#e4e4e4)
      margin-top 10px
      background #fff
      .shop_header
        padding 10px 10px 0
        .shop_icon
          margin-left 5px
          color #999
        .shop_header_title
          color #999
          font-size 14px
          line-height 20px

</style>
